The inventive process chamber engine (PKM) is a combustion piston engine comprising a process chamber as a novel form of pre-combustion chamber, into which liquid fuel continuously flows and is processed therein over a plurality of cycles to form PKM fuel. A process chamber (PK) is arranged above the press chamber and separated therefrom by a tight dividing wall, fuel being compressed into said process chamber over a long phase (gear-type pump), evaporated therein and processed by a gas which is injected into said chamber and has a high oxygen content in such a way as to form a fuel containing gas, and optionally smoke and soot. The process chamber contains fuel for at least two cycles, said fuel being permanently at an approximately maximum pressure higher than that of the piston and permanently at the process temperature (e.g. 80O°C). The fuel to be burned in the respective cycle flows over a valve (an approximately pneumatically actuated cylinder valve), which is open in the culmination region, into the combustion engine. The process chamber is surrounded by a pressure wall enclosing a pore wall containing pores through which a pore flow having a high oxygen content flows inside the process chamber (maintaining pressure without heat and heat without pressure). The invention also relates to double pump systems for fuel or lubricant, and starting igniters controlled by a Peltier flow and comprising a temperature regulator.